Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Conservation of Declining Populations

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

Conservation of Small Populations

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...

Predator-Prey Interactions

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.

Mutation, Gene Flow, and Genetic Drift

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).

Genetic Drift

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.

Speciation Rates

Speciation Rates

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Analytical performance and potential clinical utility of the GenMark Dx ePlex® blood culture identification gram-positive panel.

Diagnostic microbiology and infectious disease·2022

Same author

Salvaging the dehisced glans penis.

Journal of pediatric urology·2018

Same author

The influence of resting blood pressure on muscle strength in healthy adults.

Blood pressure monitoring·2018

Same author

Molecular fingerprinting of principal neurons in the rodent hippocampus: A neuroinformatics approach.

Journal of pharmaceutical and biomedical analysis·2017

Same author

Fluctuations of observed breeding Rough-legged Hawks and Gyrfalcons: regularity reconsidered.

Oecologia·2017

Same author

A self-sustaining process model of inertial layer dynamics in high Reynolds number turbulent wall flows.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences·2017

Search research articles

Related Experiment Video

Updated: Mar 6, 2026

Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

Published on: March 8, 2020

Breeding population fluctuations in some raptors.

D P Mindell¹, J L B Albuquerque², C M White²

¹G.S. Wise Faculty of Life Sciences, Dept. of Zoology, Tel Aviv Univ., Tel Aviv, Israel.

|March 18, 2017

Summary

This summary is machine-generated.

Greater food habit diversity in raptors correlates with stable annual populations. Population fluctuations in Rough-legged Hawks and Gyrfalcons suggest shared environmental stresses influence their numbers.

Keywords:

Breeding population Fluctuations Food habits Raptors Regularity

More Related Videos

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients

Published on: August 22, 2018

A Video Surveillance System to Monitor Breeding Colonies of Common Terns Sterna Hirundo

A Video Surveillance System to Monitor Breeding Colonies of Common Terns Sterna Hirundo

Published on: July 22, 2018

Related Experiment Videos

Last Updated: Mar 6, 2026

Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

Published on: March 8, 2020

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients

Published on: August 22, 2018

A Video Surveillance System to Monitor Breeding Colonies of Common Terns Sterna Hirundo

A Video Surveillance System to Monitor Breeding Colonies of Common Terns Sterna Hirundo

Published on: July 22, 2018

Area of Science:

Ecology
Zoology
Conservation Biology

Background:

Raptor populations face environmental challenges impacting stability.
Understanding population dynamics is crucial for conservation efforts.

Purpose of the Study:

To investigate annual breeding population stability in raptors.
To examine the relationship between population stability and food habit diversity.
To identify factors influencing raptor population fluctuations.

Main Methods:

Chi-square tests and logistic growth equations for population size analysis.
Serial correlation analysis to assess population fluctuation regularity.
Comparative analysis of food habit diversity and population variability across species and locations.

Main Results:

Peregrine Falcon (Falco peregrinus) populations showed stability during recovery.
Rough-legged Hawk (Buteo lagopus) and Gyrfalcon (F. rusticolus) populations fluctuated, with synchronous declines suggesting shared environmental stresses.
Red-tailed Hawk (Buteo jamaicensis) populations exhibited 3-year fluctuation regularity in Idaho.
Greater food habit diversity was associated with more stable annual raptor populations.
Reduced annual population variability in Rough-legged Hawks correlated with less severe climates.

Conclusions:

Food habit diversity is a significant factor in raptor population stability.
Environmental factors, not just food availability, drive population fluctuations.
Raptor population dynamics and regularity require broader geographic and temporal investigation beyond arctic regions.